Sifter



1 1, 192&

. J. SHARP SIFTER Patented Sept. 11, 1928.

UNITED .STA

TES

PATENT; OFFICE.

JOHN sinner, or CLEVELAND, OHIO.

Application filed January 25,1927. Serial No. 163,321.

A further object is to employ a sifter having oscillating spring beaterarms provided wit-h laterally spaced free vibrating extremitiestha-t bytheir vibrations will break up lumps of material and will also agitateit' between them thus enabling it to more readily pass through themeshes of a sieve, and also will exert an adjustable amount of pressureupon the sieve to press the finely ground material through the sieve. Inthis device pivotal bearings for the beater arms are enclosed within thecontainer and no openings are left for fine material to escape, alsothesieve beingresilient is caused to vibrate as the spring beater arms passback- Wards and forwards over it.

Also a more economical use of power is provided and a quicker and moreefficient action is obtained than by the use of the well knownrevolvingbeaters, owing to the suddenreversal of movement of the freebeater l arms which causes them to vibrate rapidly, and exert a rubbingpressure on the material, similar to that of'rubbing with the fingers,

1 also the swift snappy action obtained by oscillating overlappingspring beaters vibrating towards and from each other over, the surfaceof the sieve-breaks up the lumps of material quickly.

The invention is exemplified in a flour sifter, and comprises thecombination and arrangement with a container having a sieve in, itslower end, of connected spring beater arms having their extremities freeto vibrate and conformingin shape to the surface of said sieve. Thesebeaters arms. preferably extend from opposite sides of thecontainertowards each other and their free ends are spaced apart andoverlap each other and preferably lie at a slight angle to each other,thus providing a space between them in fwhich the material is workedbackwards and "forwards until it is passed through the sieve- Also thespring beater arms are mounted integrally upon a common transversemember 4 which is pivoted in the walls of the co'ntainer, and isprovided with an offset crank or operating arm by means of Which'aspring (returned plunger or push rod is enabled to operate the same.Bearing pins or journals arepreferably employed that are secured to thewalls ofthe container in. such a. manner that no openings will remainforleakage of fine mat arialtherethrough; i 4

The invention further consists in the combination and arrangement ofparts and construction of details hereinafter described,

illustrated in the accompanying drawings,

and specifically pointed out inthe claims.

In the accompanying drawings, Figure 1 is 'a vertical section of thedevice. Figure 2 is a plan thereof. Figure 3'i'sa perspective of thebeater arms and crankshaft therefor.

Figure 1 is a perspective ofthe plunger for operating the heaters Fig. 5is a plan of the support piece for the plunger. Figure 6 is a transversesection showing one of the beater journals and the manner of attachingit to the wall. Figure 57 is an elevation showing finger operated wireleverfor actuating the plunger. Figure 8 shows a sheet metal lever forthe same purpose; Figure 9-is a section showing a pulled'plunger andcoinpressionreturn spring therefor. I

In these views, A shows a cylindrical contamer having a concave wiresieve Bat its lower end. C, C, are spring beater arms which areintegrally attached to a diametrical shaft bar ormember-D, \vhich'isprovided with a central offset eye E, serving as a crank bearing foroperating the same. i The beaterarms extend across the container fromthe opposite side and are free at their outer ends and conform to theshape of the wire sieve and at their points of union with the.diametrical bar are provided with bearings necting bar I) are rocked togive a vibrating movement to the bcaters over the surface of the sievewith which they make spring con-' tact, from one side to theotherthereof, and

he heaters overlap and are spaced apart preferably at an angle to eachotherso as .to

include a mass of flour between them, which is gradually pushed orrubbed through the meshes of the sieve as the heaters pass backward andforward over the same.

The ends of the beaters are free to vibrate separately and in thesameoropposite directions and a quick movement is imparted to them by meansof aplungerH driven forcibly by hand in one direction while anequallyquick return movement is imparted by means i of a coiled spring I, whichmaybe a tension springasshoivn in Figure's L2,; aiidfnhd 8, or acompression spring as shown in F 1gure mp 'fl'q'v W h' The result of thequick forward and backward movements is to cause the free ends of;

' hearing K (shown as a hook) at the inner end Eengageswith theeye E inthe offset portion ;.0f the transverserod or bar D,

' whiclrserves as a cra nk byimeans of which 7 thevbeaters;areoscillatedThe coiled spring shown in Eignresl and 4 engaged .with a notchKinthe'ho'olc K, at one end above thwc'rank, :and adjacent to the otherend qvitlntlhelsides-Jyof htheslotted guide J. The pring also locks, thehook Kin place.

.,The spring can be "lengthened-or shortened by releasing one end fromthe. hook and ro- .tating: it in the sides of the slot, after whichtheqend can-beiagain attached to the hook. The ,blank iroifn ,which thisguide is stamped is'shown in Fig. 5, the corners at J, Jy being foldedover. to prevent the plunger rod from coming out of the slot, and terl fdeml 601: the pring 1. Vin plac The guide maybe;{setpponthe edge, Of/thecontainer and they tongueportionJ taken fl'QHlifi-hl; slot' may; bepressed back over the e Q the ont n r i vl:

L. 1'lhsz e mierl; i e ext emi ie J r P e sed:ieid n a hi e h nd eL- i.t lie iee ee e :Gs Gr ere;.. 0i'med with zereeent r t at P eve t he fr,comingdoosened fro n the thin metal that frpi ns the sides of thecontainer, and a washer G? is secured to the outerside thus sealing theopening in the can to prevent thei escape of'flour, and to provide asubstantial bearingfor the eyes F F.

In *i ures andS a trigger lever M is shown For operating the pl nnger,and in Figure!) the outer end of the plunger or push rod is bentdownsoas to form a trigger tbatca n also be, operated by the same hand "thatholds the container,

IniEigureslandQ and 2 long spring ivashers G G, are employed upon whichthe journals. are riyeted as shown i112.

By lifting these long sp'ring washers the joii rn be withdrawn to permitthe bea er armsfio be removed the iion'strnction shpwn in Figure 7 thejournals are. immovable i n the walls A grind the transverse bar D is'sprung slightly to enable fthe craiik eyes FF to -be slipped overestmates, .G. h v py T ing 'de's cribe'd inth e invention what .J 'new anddesire to secure by 'Ilel tei's Patent is}; p I H I. In a'siaeatheembination with a cond's iifl r tsei fh k have, .i t h r Pl rnqe edsnen ta1ner,. having a. semi-spherical siehe ad acent to its lowerend, of spring beater arms movable backwards and forwards over thesurfade of said sieve, a common crank con- -necting member for saidheaters, saidmemer being pivoted diametrically across said containen andmeans locatcd in the container for oscillating said cranked member andattachcdsp'ring heaters; a H y y 2. In sitter, the combinationwitlracontainer, iaving a semi 'spherical concave sieve adjacent t its ower'nch Q spri gs bea'ter arms movable backwards and forwards over thesurface of said siev e a common cranked shaft-connecting member for sa lmi ers, a me b ng riveted diametrically acrosssaid container, andl'eeiprocatingneans foroscillatin' sai d con- IIEGtIIIgJDQIHlDQl andattached spr ng beters,

o i h said h a s eviegus ch .91

fre ex emi y, e. i d. l sete nheing spaced laterally apart andoverlapping each other.

hl w be t s f rm t n ins 1 me al ove la pin e o her and, la l seated.spea hea .h vi s ashless et e eity .arisid o nection between the otherextreinitiesof said heaters, said rigid conneotio n being prd thereof,and with a cranl; ar n intermediate of t ndwede P 'fi JP S P ge for prat ng dic ie ki mz 5. a device of the character described, easing le se a e therein-spr n heaters vibratable and pivoted in said cylinderoversaid sieve, a cranl; gfior ope ratin said beaters, a plnnge gmon'nted inthe w a l of said cylinder, and operatiyely co n ected said plun er-said spring beingfidjhstedto prevent t e occurrence 0t aldead cehtribetween said crank and the pivot point of said boaters. v 'ItI a containera brackeoprnpniited. nppnone a; vertical movable insaid slot, andaretnrn pr ngflfor a le b at.haematite,

with said crank and a return spring: for

a device of the described,

a container, a bracket mounted upon one edge thereof, said brackethaving a vertical slottherein, a plunger rod mounted in and movable insaid slot and a return spring for said plunger adjustable in theinwardly turned edges of said slot, spring heaters revolvable acrosssaid container and sieve, a cranked connecting shaft therefor, the innerend of said shaft being provided with a crank bearing and the inner endof said spring being connected with said rod at a point above said crankin said shaft for the purpose set forth.

8. In a device of a character described, an oscillating beater shaftprovided with a crank arm, a longitudinally movable rod for operatingthe same, said rod having a hook extremity engaging with sald crank arm,

and a return spring for said rod, one extremity of said sprin beinsecured to said hook above said hoo and operating as a retainer for thehook in said crank.

9. In a device of a character described,

an oscillating beater shaft provided with a crank arm, a longitudinallymovable rod for operating the same, said rod having a hook extremityengaging with said crank arm, and

signature.

JOHN SHARP.

